Scheduling Aircraft Takeoffs and Landings Considering Taxi Times and Landing Delay Patterns

, M.Sc. Thesis Sharif University of Technology Reihaneh, Hamed (Author) ; Radman, Maryam (Supervisor) ; Reihaneh, Mohammad (Supervisor)

Abstract

Efficient utilization of runways, as major bottlenecks at airports, not only minimizes flight delays but also plays a vital role in reducing fuel emissions and mitigating environmental impacts. Aircraft scheduling problem studied in this paper seeks to improve this efficiency through optimally scheduling departure/arrival aircraft on multiple runways. The primary innovation of this study lies in accounting for aircraft taxi times between runways and gates, as well as the landing delay patterns, which have not been simultaneously addressed in the literature. To solve the problem, an enhanced branch-and-price method has been developed, improving upon existing approaches in the literature. It...

Seismic analysis of a system of dam-massed foundation-reservoir under inclined excitation

, Article JVC/Journal of Vibration and Control ; 2021 ; 10775463 (ISSN) Sotoudeh, P ; Ghaemian, M ; Sharif University of Technology

SAGE Publications Inc 2021

Abstract

One of the acceptable assumptions in engineering practice is vertical propagation of earthquake waves. When the source of earthquake is located very deep in the ground, this assumption is valid, but for sources located in shallow ground, it loses its viability. In this study, linear seismic analysis of a system of concrete dam-massed foundation-reservoir is performed under inclined earthquake excitation. Both P- and SV-type earthquakes are considered for the purpose of the seismic analysis. To consider the effects of inhomogeneous waves for the case of SV wave propagation, post-critical angles are also considered in the analysis. To investigate the effects of earthquake frequency content on...

Seismic analysis of a system of dam-massed foundation-reservoir under inclined excitation

, Article JVC/Journal of Vibration and Control ; Volume 28, Issue 13-14 , 2022 , Pages 1769-1780 ; 10775463 (ISSN) Sotoudeh, P ; Ghaemian, M ; Sharif University of Technology

SAGE Publications Inc 2022

Abstract

One of the acceptable assumptions in engineering practice is vertical propagation of earthquake waves. When the source of earthquake is located very deep in the ground, this assumption is valid, but for sources located in shallow ground, it loses its viability. In this study, linear seismic analysis of a system of concrete dam-massed foundation-reservoir is performed under inclined earthquake excitation. Both P- and SV-type earthquakes are considered for the purpose of the seismic analysis. To consider the effects of inhomogeneous waves for the case of SV wave propagation, post-critical angles are also considered in the analysis. To investigate the effects of earthquake frequency content on...

Seismic analysis of reservoir-gravity dam-massed layered foundation system due to vertically propagating earthquake

, Article Soil Dynamics and Earthquake Engineering ; Volume 116 , 2019 , Pages 174-184 ; 02677261 (ISSN) Sotoudeh, P ; Ghaemian, M ; Mohammadnezhad, H ; Sharif University of Technology

Elsevier Ltd 2019

Abstract

Seismic analysis of complex structures such as concrete dams has been the subject of numerous studies. One of the challenges in seismic analysis of such systems is proper modelling of massed foundation. Since concrete dams’ foundations are usually layered, this makes the homogenous half-space assumption relatively unrealistic. In this paper, the effects of massed layered foundation on seismic response of concrete gravity dams in dam-reservoir-foundation systems are investigated. Seismic finite element analysis of the system carried out using domain reduction method. This approach is compared with another available method named, free-field column. First set of analysis considers the effect of...

Seismic analysis of reservoir-gravity dam-massed layered foundation system due to vertically propagating earthquake

, Article Soil Dynamics and Earthquake Engineering ; Volume 116 , 2019 , Pages 174-184 ; 02677261 (ISSN) Sotoudeh, P ; Ghaemian, M ; Mohammadnezhad, H ; Sharif University of Technology

Elsevier Ltd 2019

Abstract

Seismic analysis of complex structures such as concrete dams has been the subject of numerous studies. One of the challenges in seismic analysis of such systems is proper modelling of massed foundation. Since concrete dams’ foundations are usually layered, this makes the homogenous half-space assumption relatively unrealistic. In this paper, the effects of massed layered foundation on seismic response of concrete gravity dams in dam-reservoir-foundation systems are investigated. Seismic finite element analysis of the system carried out using domain reduction method. This approach is compared with another available method named, free-field column. First set of analysis considers the effect of...

Thermal Analysis of Concrete arch Dams Using Real Reservoir Data and Comparing the Results with Stucky-derron Method

, M.Sc. Thesis Sharif University of Technology Sotoudeh Foumani, Payam (Author) ; Ghaemian, Mohsen (Supervisor)

Abstract

Thermal analysis of concrete arch dams is always an important issue in designig these enormous concrete structures. The reason this issue mainly concerns arch dams and not gravity dams is because of little thickness of arch dams which makes them prone to cracking due to thermal loading. To solve any thermal problem we need boundary conditions. In arch dam case, these boundaries are the temperature of the upstream and downstream face of the dam which, depending on circumstances, can be in touch with water or air. Estimating air temperature is a fairly easy task when you have monthly mean temperatures. The challenging part is defining water temperature in any depth of the reservoir whenever we...

Analytical and Experimental Modeling and Predicting Chatter Occurrence during Thin-walled Parts Milling

, M.Sc. Thesis Sharif University of Technology Sotoudeh, Mahsa (Author) ; Movahhedy, Mohammad Reza (Supervisor)

Abstract

Milling of thin-walled parts is a widely used process in aeronautical and automotive industries. Along the milling of these low rigidity parts, large quantities of material are removed using high removal rate conditions with the risk of the instability of the process as the result of chatter vibration. Self-excited chatter vibration is an undesirable phenomenon in all machining processes and many efforts have been made in order to understand its mechanism and deal with its destructive effects. Studying chatter in machining processes with variable dynamics, which this thesis represents an instance of it, has been taken into consideration in the recent years. Most of researches done in this...

Seismic Analysis of Concrete Gravity Dams Considering Layered Foundation Using Domain Reduction Method

, Ph.D. Dissertation Sharif University of Technology Sotoudeh Foumani, Payam (Author) ; Ghaemian, Mohsen (Supervisor)

Abstract

Nowadays, due to advancements in technology and processing power, earthquake engineering is moving toward more realistic modeling of actual problems in different fronts. In the case of considering seismic waves for design and analysis of concrete dams, numerous challenges exists due to complex nature of the problem which have absorbed abundant attention from a number of researchers around the world. In recent studies about earthquake input mechanisms, accounting for true nature of the foundation and applied earthquake have been hot topics. Therefore, in this thesis, thorough investigation on these effective factors in dynamic analysis of concrete dams is performed.In the first part of this...

Analysis of Hidden-policy Attribute-based Access Control Schemes for Cloud Environment

, M.Sc. Thesis Sharif University of Technology Sotoudeh, Reihaneh (Author) ; Eghlidos, Taraneh (Supervisor) ; Mohajeri, Javad (Supervisor)

Abstract

Ciphertext-Policy Attribute-Based Encryption (CP-ABE) is a promising access control mechanism for securing cloud data. In ciphertext-policy attribute-based encryption schemes, an access structure is sent along each ciphertext to specify authorized recipients. However, this approach can inadvertently expose users' privacy and compromise the integrity of the messages. To address these challenges, hidden-policy attribute-based encryption schemes have been developed. While numerous methods have been proposed to hide the access policy, limited research has comprehensively evaluated their effectiveness, particularly in terms of security and privacy guarantees. In this thesis, we first review and...

Characterization of nanostructured biodegradable Zn-Mn alloy synthesized by mechanical alloying

, Article Journal of Alloys and Compounds ; Volume 735 , 2018 , Pages 1319-1327 ; 09258388 (ISSN) Sotoudeh Bagha, P ; Khaleghpanah, S ; Sheibani, S ; Khakbiz, M ; Zakeri, A ; Sharif University of Technology

Elsevier Ltd 2018

Abstract

In this study, nanostructured biodegradable pure Zn, Zn-4 wt. % Mn and Zn-24 wt % Mn alloys were produced by 20 h mechanical alloying and consequent cold pressing and sintering. Structural evolutions were investigated using the X-ray diffraction technique. Also, the microstructure was characterized by scanning electron microscopy. The effects of alloy composition on density, mechanical properties, corrosion behavior in Hank's solution, cell viability and cell attachment were investigated. Crystallite size of the synthesized alloys after 20 h of milling reached to less than 40 nm and remained less than 80 nm after consolidation and sintering for 1 h. Alloys contain MnZn13 as second phase...

Hearing loss prevalence and years lived with disability, 1990-2019: Findings from the Global Burden of Disease Study 2019

, Article The Lancet ; Volume 397, Issue 10278 , 2021 , Pages 996-1009 ; 01406736 (ISSN) Haile, L. M ; Kamenov, K ; Briant, P. S ; Orji, A. U ; Steinmetz, J. D ; Abdoli, A ; Abdollahi, M ; Abu-Gharbieh, E ; Afshin, A ; Ahmed, H ; Rashid, T. A ; Akalu, Y ; Alahdab, F ; Alanezi, F. M ; Alanzi, T. M ; Al Hamad, H ; Ali, L ; Alipour, V ; Al-Raddadi, R. M ; Amu, H ; Arabloo, J ; Arab-Zozani, M ; Arulappan, J ; Ashbaugh, C ; Atnafu, D. D ; Babar, Z. U. D ; Baig, A. A ; Banik, P. C ; Bärnighausen, T. W ; Barrow, A ; Bender, R. G ; Bhagavathula, A. S ; Bhardwaj, N ; Bhardwaj, P ; Bibi, S ; Bijani, A ; Burkart, K ; Cederroth, C. R ; Charan, J ; Choudhari, S. G ; Chu, D. T ; Couto, R. A. S ; Dagnew, A. B ; Dagnew, B ; Dahlawi, S. M. A ; Dai, X ; Dandona, L ; Dandona, R ; Desalew, A ; Dhamnetiya, D ; Dhimal, M. L ; Dhimal, M ; Doyle, K. E ; Duncan, B. B ; Ekholuenetale, M ; Filip, I ; Fischer, F ; Franklin, R. C ; Gaidhane, A. M ; Gaidhane, S ; Gallus, S ; Ghamari, F ; Ghashghaee, A ; Ghozali, G ; Gilani, S.A ; Glǎvan, I. R ; Golechha, M ; Goulart, B. N. G ; Gupta, V. B ; Gupta, V. K ; Hamidi, S ; Hammond, B. R ; Hay, S. I ; Hayat, K ; Heidari, G ; Hoffman, H. J ; Hopf, K. P ; Hosseinzadeh, M ; Househ, M ; Hussain, R ; Hwang, B. F ; Iavicoli, I ; Ibitoye, S. E ; Ilesanmi, O. S ; Irvani, S. S. N ; Islam, S. M. S ; Iwagami, M ; Jacob, L ; Jayapal, S. K ; Jha, R. P ; Jonas, J. B ; Kalhor, R ; Al-Salihi, N. K ; Kandel, H ; Kasa, A. S ; Kayode, G. A ; Khalilov, R ; Khan, E. A ; Khatib, M. N ; Kosen, S ; Koyanagi, A ; Kumar, G. A ; Landires, I ; Lasrado, S ; Lim, S. S ; Liu, X ; Lobo, S. W ; Lugo, A ; Makki, A ; Mendoza, W ; Mersha, A. G ; Mihretie, K. M ; Miller, T. R ; Misra, S ; Mohamed, T. A ; Mohammadi, M ; Mohammadian Hafshejani, A ; Mohammed, A ; Mokdad, A. H ; Moni, M. A ; Kandel, S. N ; Nguyen, H. L. T ; Nixon, M. R ; Noubiap, J. J ; Nuñez Samudio, V ; Oancea, B ; Oguoma, V. M ; Olagunju, A. T ; Olusanya, B. O ; Olusanya, J. O ; Orru, H ; Owolabi, M. O ; Padubidri, J. R ; Pakshir, K ; Pardhan, S ; Kan, F. P ; Pasovic, M ; Pawar, S ; Pham, H. Q ; Pinheiro, M ; Pourshams, A ; Rabiee, N ; Rabiee, M ; Radfar, A ; Rahim, F ; Rahimi Movaghar, V ; Ur Rahman, M. H ; Rahman, M ; Rahmani, A. M ; Rana, J ; Rao, C. R ; Rao, S. J ; Rashedi, V ; Rawaf, D. L ; Rawaf, S ; Renzaho, A. M. N ; Rezapour, A ; Ripon, R. K ; Rodrigues, V ; Rustagi, N ; Saeed, U ; Sahebkar, A ; Samy, A. M ; Santric-Milicevic, M. M ; Sathian, B ; Satpathy, M ; Sawhney, M ; Schlee, W ; Schmidt, M. I ; Seylani, A ; Shaikh, M. A ; Shannawaz, M ; Shiferaw, W. S ; Siabani, S ; Singal, A ; Singh, J. A ; Singh, J. K ; Singhal, D ; Skryabin, V. Y ; Skryabina, A. A ; Sotoudeh, H ; Spurlock, E. E ; Taddele, B. W ; Tamiru, A. T ; Tareque, M. I ; Thapar, R ; Tovani-Palone, M. R ; Tran, B.X ; Ullah, S ; Tahbaz, S. V ; Violante, F. S ; Vlassov, V ; Vo, B ; Vongpradith, A ; Vu, G. T ; Wei, J ; Yadollahpour, A ; Jabbari, S. H. Y ; Yeshaw, Y ; Yiǧit, V ; Yirdaw, B. W ; Yonemoto, N ; Yu, C ; Yunusa, I ; Zamani, M ; Zastrozhin, M. S ; Zastrozhina, A ; Zhang, Z. J ; Zhao, J. T ; Murray, C. J. L ; Davis, A. C ; Vos, T ; Chadha, S ; Sharif University of Technology

Elsevier B.V 2021

Abstract

Background: Hearing loss affects access to spoken language, which can affect cognition and development, and can negatively affect social wellbeing. We present updated estimates from the Global Burden of Disease (GBD) study on the prevalence of hearing loss in 2019, as well as the condition's associated disability. Methods: We did systematic reviews of population-representative surveys on hearing loss prevalence from 1990 to 2019. We fitted nested meta-regression models for severity-specific prevalence, accounting for hearing aid coverage, cause, and the presence of tinnitus. We also forecasted the prevalence of hearing loss until 2050. Findings: An estimated 1·57 billion (95% uncertainty...